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Split the Cocoa-facing parts of JavaScriptAppModalDialogCocoa into a
separate views_bridge_mac::AlertBridge class, implementing a mojo
interface of the same name.

The mojo interface has a single method, Show, which has a single
callback, indicating the disposition of the alert.

Make JavaScriptAppModalDialogCocoa instantiate
views_bridge_mac::AlertBridge across mojo either in-process or
out-of-process as needed. Note that this subtly changes the behavior of
JavaScriptAppModalDialogCocoa::AcceptAppModalDialog in that it will no
longer attempt to read the dialog's text when programmatically
quitting (note that this feature may be dead code).

This makes alerts appear in the appropriate process. Note that the
alerts of PWAs and of Chrome are still interconnected. Only one alert
may be present at once, and an active alert will take focus from Chrome
and all PWAs.

Bug: 898604
Change-Id: I37267cf7aa41d8e68cb2d342a5058e257b2d4385
Reviewed-on: https://chromium-review.googlesource.com/c/1390757Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#619812}